Safety control and ignition means for multiple gas burners



y E. w. ROBERTS ET AL.

SAFETY CONTROL AND IGNITION MEANS FOR MULTIPLE GAS BUBNERS Filed Feb. 25, 1935 2 Sheets-Sheet 1 INVENTORS AT I'O RN EYS May 3 19334 E. w. ROBERTS ET AL 3 SAFETY CQNTROL AND IGNITION MEANS FOR MULTIPLE GAS BURNERS Fil ed Feb. 25, 1955 2 sheets-sheet 2 INVENTOFIS EARL w. ROBERTS THOMAS L.FERRALL ATTO RN EYS Patented May 1.938

, UNITED STATES PATENT OFFICE z,1 19.4t4 SAFETY. GONTROLAND IGNITION MEANS i J FOR. MULTIPLE GAS BURNERS j Earl W. Roberts and Thomas L. Ferrall, Detroit.

Mich., assignors to The Roberts Brass Manufacturing Company, Detroit,Mich., a corporation of Michigan" Application February 25, 1935. Serial No. 8,180 12 Claims. (Cl.158--117.1)

The invention relates to safety control and ignition means for gas ranges,includingopen top and oven burners. It isone of the objects of the invention to obtain a construction, containing a 55 screws J and the bend in the u is located directly abovethe flame of the pilot so thatthe latter will impinge thereon. The free logo! the U is connected by a 1mm. with a bell crank lever L fulcrumed upon a bracket :L which is integral plurality of pilots for different burnersinwhich with the capL for the valve casing I and which 5 p i the. extinguishing of anyone of said pilots. will also forms the support for the burnerJ. "The shut oil the gas supply, not onlyto the burners stem I of the valveI extends outward through but tothe pilots also. It is a further object to the cap L and at its outer end is engaged by an combine with" this structure means .for quickly adjustable screw L on the bell crank lever L, lighting the eirtinguishedpilots and after abrief The arrangement is such thatthe heat of the 10 interval automatically opening the gas supply to pilotflame on the bend of the U-shaped member the burners. Still another object is to facilitate K will move the free leg thereof outward, transthe lighting of the oven burner by locating the mitting this movement through the link L to the i F pilot theref or within the oven while at the same bell crank lever L and from the latter through time guarding against any escape of unignited the screw L to the stem 1, forcing thisinwai'd l5 gas which might form within the enclosure an and separating. the valve I from its seat. A

explosivemixture. With theseand otherobjects spring. I within the valve casing opposes this in view the invention consists in the construction moving of the valve and operates upon the extinas hereinafter set forth. H guishing of the pilot and cooling of the member 9 6 In the drawings: T i K to again force the valve F to its seat. The pilot Figlis a plan viewof a gas range to which our J also forms the lighter for the burners B, B, B.

improvements are applied; f B and to this end the pilot is enclosed in a cylin- 2 is a diagrammatic side elevation illusdrical casing J havingradiating tubes J extend trating the connections between the severaleleing in proximity to the'respective burners and mentsof the structure; i adapted to receive gas therefrom. Thus upon the 1 Fig. 3 is a perspective viewof the oven ignition turning on of any one of theseburners gas will .1 and control unit; i travel through the tube J to the pilot and the Figfl lis asection alside elevation of the autojflame will flash back to the burner to light the matic shut-off valve and its actuating mechasame. i i nism; g i The oven burner D is lighted from a second Fig. 5. is a longitudinal section on line 5-5, pilot burner M which is mounted on a bracket Fig. 3; M secured within the oven to a side wall thereof. Fig. 6 is a section through the push button A thermal motor M similar to the thermal motor control valve. t i Khas one leg thereof secured to the bracket M" t The gas rangeto whichour improvements are with the bend of the U located above the flame of 35 applicable maybe of any suitable construction the pilot. The bracket M' is also provided'with i including an open top sectionAhaving a plua shelf portion M on which is pivoted a bell rality of burners B, B, B B v and an oven seccrank lever M. M is a tubular bearing on the :tion. .0 provided with a burner D. E is a gas shelf M which extends outward through anapersupply conduit shown as extending across the ture in the oven wall. This bearing is internally 40 i open top section intermediate the pairs of burners threaded to engage a correspondingly threaded B, B and B B. F is a manifold to whichthe portion of a valve casing N located outside of the i conduitE is connected; G, G, G and G3 are the. oven. Within the casing N is a valve N having valves forthe burncrsB. B, B B and H is a a stem N extending axially through the portion. valve controlling the oven burner D. ofthe casing within the bearlngM into operative 45 I is an automatic shut-off valve located in the relation to the bell crank lever M so that a movesupply conduit E and controlling the supply of gas ment of the latter will unseat the valve. N and to all of the burners. .Mounted on the casing I t N arenipples on the valve casing N communiof the valve I so as. to form a unit construction cating with chambersv within said casing on 011- 59 therewith is apilot burner J, a thermalmotor K posite sides. of the seat. so that the unseating of and a connecting mechanismfbetween saidmotor the valve will establish'communlcation from one and the valve I. The thermal motor is preferably. nipple to the other. The nipple N is connected [a U-shaped bar, one leg of which is secured to by a conduit 0 to the manifold F. The nipple N a bracket J on the pilot burner J by means of is connected to a branch fitting 0', one branch of which is connected by a conduit 0 to the pilot M while the other branch is connected by a conduit to a branch fitting 0 One branch of fitting 0* is connected by a conduit 0 with the pilot J, while the other branch is connected to the casing of a push button valve P. Connected to this casing on the opposite side of the valve is a conduit P which extends to the casing I of the valve I and is connected to the gas supply side of the valve.

With the construction and arrangement of parts just described it will be observed that all of the main burners and also the pilot burners are normally supplied with gas from the manifold F, which latter receives gas from the supply conduit E whenever the valve I is in open position. However, the opening of this valve is dependent upon the operation of the pilot J and the thermal motor K actuated thereby. Consequently to start operation gas must be supplied to the pilots from a separate source, viz: through the conduit P to the push valve P. Upon oper ation of this valve P gas will pass through the branch fitting 0 and conduit 0 to the pilot J and through the other branch of the fitting O conduit 0 branch fitting O' and conduit 0 to the pilot M. Thus both of the pilots may be lighted and after burning for a short interval of time will operate with their cooperating thermal motors K and M to respectively open the shut-off valve I and the valve N. This will supply gas to the manifold F and from the latter through the conduit 0 past the open valve N to the branch fitting 0' from which gas passes to each of the pilots to maintain operation thereof after the push button is released and its valve closed.

As has been stated, the pilot M is located within the oven and is utilized for lighting the oven burner D. As the closing ofthe oven door will sometimes create sufllcient disturbance in the atmosphere to extinguish the pilot, we have sur rounded the jet by a frusto-conical shield M which protects the flame. The oven burner is lighted from the pilot through suitable means, such as a perforated extension tube or trailer projecting from said oven burner into proximity to the flame of the pilot. Thus when gas is supplied tothe oven burner, flame will flash thereto from the pilot through the comparatively short distance therebetween. Such an igniter has an advantage over those of a type in which the pilot is located outside the oven, as the longer transfer tube requiredby this arrangement is sometimes rendered inoperative by grease deposits incident to the'cooking of food in the oven. It is necessary, however, with such construction to avoid danger of forming an explosive mixture in the oven in case of the extinguishing of the pilot. With our construction such danger is avoided as the extinguishing of the pilot will cause the closing of the valve N which cuts off gas supply to the pilot J, and this in turn results in the closing of the shut-off valve I. The response to the thermal motors is sufliciently rapid so that if the pilot within the oven is extinguished the supply of gas thereto will be soon cut off.

What we claim as our invention is:

1. In combination, a gas manifold, a supply conduit therefor, an automatic valve controlling the supply of gas from the conduit to the manifold, two pilots, a second automatic valve, means for conducting gas from the manifold to said second automatic valve, means for conducting gas from sa d second automatic valve to said pilots, means for conducting gas from said conduit on the supply side of said first automatic valve to the second mentioned conducting means, a normally closed push button valve controlling the passage of gas from the third to the second mentioned conducting means, and means responsive to the heat of said pilots and operatively connected to said automatic valves for controlling the action of said automatic valves.

2. In combination, a gas manifold, a supply conduit therefor, an automatic valve controlling the supply of gas from the conduit to the manifold, two pilots, a second automatic valve, means for conducting gas from the manifold to said second automatic valve, means for conducting gas from said second automatic valve to said pilots, means for conducting gas from said conduit on the supply side of said first automatic valve to the second mentioned conducting means, a normally closed push button valve controlling the passage of gas from the third to the second mentioned conducting means, means responsive to the heat of one of said pilots for controlling the action of the second mentioned automatic valve, and means responsive to the heat of the other pilot for controlling the action of the first mentioned automatic valve.

3. In combination, a gas manifold, a conduit for supplying gas to said manifold, an automatic valve controlling the flow of gas through the conduit to the manifold, two gas pilots, a. constantly open conduit extending between said pilots, a conduit for conducting gas from the manifold to the second mentioned conduit, and an automatic valve in the third mentioned conduit for controlling the flow of gas from the third mentioned conduit through the second mentioned conduit to said pilots.

4. In combination, a gas manifold, a conduit for supplying gas to said manifold, an automatic valve controlling the flow of gas through the conduit to the manifold, two gas pilots, a constantly open conduit extending between said pilots, a conduit for conducting gas from the manifold to the second mentioned conduit, an automatic valve in the third mentioned conduit for controlling the flow of gas from the third mentioned conduit through the'second mentioned conduit to said pilots, a conduit for conducting gas from the first mentioned conduit upon the supply side of the first mentioned automatic valve to the secondmentioned conduit, and a manually operable valve in the fourth mentioned conduit for controlling the supply of gas from the first mentioned conduit to the second mentioned conduit.

5. In combination, a gas manifold, a conduit for supplying gas to said manifold, an automatic valve controlling the flow of gas through the conduit to the manifold, two gas pilots, a constantly open conduit extending between said pilots, a conduit for conducting gas from the manifold to the second mentioned conduit, an automatic valve in the third mentioned conduitfor controlling the flow of gas from the third mentioned conduit through the second mentioned conduit to said pilots, and means responsive to the heat of said pilots for opening the automatic valves.

6. In combination, a gas manifold, a conduit for supplying gas to said manifold, an automatic valve controlling the flow of gas through the conduit to the manifold, two gas pilots, a constantly open conduit extending between said pilots, a conduit for conducting gas from the manifold to the second mentioned conduit, an automatic valve in the third mentioned conduit for controlling the flow of gas from the third mentioned conduit through the second mentioned conduit to said X pilots, a conduit for conducting gas from thefirst f mentioned conduit upon the supp y side of the first mentioned automatic valve to the second I mentioned conduit, a manually operable valve I in the fourth mentioned conduit for controlling the supply of gas from the first mentioned conopen conduit extending between said pilots, a

duit to the second mentioned conduit, and means responsive to the heat of said pilots for opening the automatic valves.

7. In combination, two, gas pilots, a constantly gasmanifold, a conduit for supplying gas to said I manifold, an automatic valve responsive to the heat of one of said pilots for controlling the fiow of gas through the second mentioned conduit to the manifold, a. conduit for conducting gas from the manifold to the first mentioned conduit, and

an automatic valve in the third mentioned conduitresponsive to the heat of the other pilot for controlling the flow of gas from the third mentioned conduit through the first mentioned conduit to said pilots.

8. In combination, two gas pilots, a constantly open conduit extending between said pilots, a gas manifold, an automatic valve in constantly open communication with said manifold and connected to said conduit for controlling the supply of gas to said pilots, a supply conduit for the manifold,

an automatic valve controlling the flow of gas through thesupply conduit to the manifold, a manually operable valve in constantly open com munication with the supply conduit on the sup- I ply side of the second mentioned automatic valve,

l and means responsive to theheat of said pilots for opening the automatic valves;

9. In combination, two gas pilots, a constantly open conduit extending betweensaid pilots, an

automatic gas valve in constantly open communication with a source of gas supply and connected to said conduit for controlling the supply of gas to both said pilots, a manually operable valve in constantly open communication with a source gas from the first mentioned source may be supplied to both of said pilots.

10. In combination, two gaspilots, a constantly open conduit extending between said pilots, an

automatic gas valve in constantly open communication with a source of gas supply and connected to said conduit for controlling the supply of gas to both of said pilots, a push button valve in constantly open communication with a source of gas supply and connected to the conduit extending between said pilots so that upon actuation of said push button valve gas from the second mentioned source may be temporarily supplied to both pilots to permit them to be lighted, and means responsive to the heat of one of said pilots for opening the automatic valve so gas from the first mentioned source may be supplied to both of said pilots.

11. In combination, a gas manifold, a conduit for supplying gas to said manifold, a shut-off valve in said conduit biased to automatically close, a thermal motor for opening said valve, a gas pilot operatively associated with said thermal motor to actuate the same, means for conducting gas from the manifold to said pilot, a shut-off valve in said conducting means biased to automatically close, a thermal motor for opening the second mentioned shut-off valve, a gas pilot operatively associated with the second mentioned thermal motor to actuate the same, and

means on the delivery side of the second mentioned shut-off valve for conducting gas from the first mentioned conducting means to the second mentioned pilot.

12. In combination, a gas manifold, a conduit for supplying gas to said manifold, a shut-oil valvein said conduit biased to automatically close, a thermal. motor for opening said valve, a gas pilot operatively associated with said thermalmotor to actuate the same, means for conducting gas from the manifold to said pilot, a shut-ofi valve in said conducting means biased to automatically close, a thermal motor for opening the second mentioned shut-off valve, a gas pilot operatively associated with the second mentioned thermal motor to actuateithe same, means on the delivery side of the second mentioned shut-off valve for conducting gas from the first mentioned conducting means to the second mentioned pilot, means for conducting gas from the conduit on the supply side of the first mentioned shut-off valve to the first mentioned conducting means on the discharge side of the second mentioned shut-off valve, and a normally closed valve in saidthird mentioned conducting means operable when the first mentioned shut-off valve is closed to permit gas on the discharge side of the second mentioned shut-off valve to be bypassed from said conduit to said pilot burners.

EARL W. ROBERTS.

THOMAS L. FERRALL. 

